Trimming die and punch thereof

ABSTRACT

A trimming die includes a first die base assembly, a second die base assembly, and a trimming punch. The first die base assembly includes a fixing portion; the second die base assembly is positioned opposite the first die base assembly; the second die base assembly includes a die cavity portion; the die cavity portion has a die cavity and a die cavity inner wall; the die cavity inner wall has a plurality of first slant grooves; the punch has a fixing end portion and a trimming end portion positioned opposite the fixing end portion; the fixing end portion is disposed at the fixing portion; the trimming end portion is positioned corresponding to the die cavity; a peripheral surface of the trimming end portion includes a plurality of second slant grooves. A trimming punch is also provided.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Taiwan Patent Application No.101150945, filed on Dec. 28, 2012, which is hereby incorporated byreference for all purposes as if fully set forth herein.

TECHNICAL FIELD

The disclosure relates to a die and a punch thereof, and particularly toa trimming die and a trimming punch thereof.

BACKGROUND

The recent decade witnesses a rapid development of the electronicsindustry, along with which the sales volume of consumer electronics suchas cell phones and notebook computers rises significantly. In recentyears, these products are developed following the trend of small volume,light weight, desirable strength, and easy heat dissipation, so thecomponents thereof also need to be metalized and refined. Producingcomponents using semiconductors or non-conventional process has thedisadvantages of high equipment cost, restrictions on materials appliedin the process, a small depth-to-width ratio, and difficulty inproducing three-dimensional components.

The stamping process is one of the key technologies for mass productionof metal components in the conventional manufacturing industry.Trimming, drawing and bending dies are widely applied throughout theentire stamping process for various purposes. The stamping process hasthe advantages of high production efficiency, material conservation,high precision, good mechanical properties of finished products,unrestricted material application, and simplified component design, andcomplies with the current environmental concept requirement of greenindustry. Hence, the application of stamping metal in a micro-component,which is referred to as micro-stamping, is attracting more and moreattentions.

Referring to FIG. 1A and FIG. 1B, FIG. 1A is a local schematic view of aconventional trimming die before a trimming punch thereof performs atrimming operation on a blank; FIG. 1B is a local schematic view of aconventional trimming die in FIG. 1A when a trimming punch thereof isperforming a trimming operation on a blank.

As shown in FIG. 1A and FIG. 1B, the trimming die 5 includes a first diebase assembly (for example, an upper die base assembly) and a second diebase assembly (for example, a lower die base assembly) positionedcorresponding to the first die. A trimming punch 50 and a blank holder51 are disposed on the first die base assembly; the second die baseassembly includes a die block 52, and the die block has a die cavity520.

When an operator wants to perform a trimming operation on a blank 53,the blank holder 51 and the die block 52 of the trimming die may be usedto fix the blank 53 at a processing position, and then a downwardtrimming force F of the trimming punch 50 is used to accomplish thetrimming operation on the blank 53 (for example, forming a round hole ata central part of the blank 53, or shearing a part of a side edge of theblank 53).

However, an external peripheral surface of the trimming punch 50 of theconventional trimming die 5 or an inner wall of the die cavity 520 ofthe die block 52 of the second die base assembly does not have a specialmicro-structural design, so the trimming processing quality of the blank53 is not as good as expected.

SUMMARY

The disclosure provides a trimming die capable of improving trimmingquality of a blank, and a trimming punch thereof.

Accordingly, the disclosure provides a trimming die, comprising a firstdie base assembly, a second die base assembly and a trimming punch,wherein the first die base assembly comprises a fixing portion; thesecond die base assembly is positioned opposite the first die baseassembly; the second die base assembly comprises a die cavity portion;the die cavity portion has a die cavity and a die cavity inner wall; thedie cavity inner wall has a plurality of first slant grooves; thetrimming punch has a fixing end portion and a trimming end portionpositioned opposite the fixing end portion; the fixing end portion isdisposed at the fixing portion, the trimming end. portion is positionedcorresponding to die cavity, and a peripheral surface of the trimmingend portion comprises a plurality of second slant grooves.

In the trimming die according to the embodiment of the disclosure, thefirst die base assembly further comprises a bolt element and a blankholder positioned corresponding to the die cavity portion, wherein anend of the bolt element is disposed at the fixing portion, and anotherend of the bolt element is disposed at the blank holder; the first diebase assembly and the second die base assembly further comprise a guidepillar therebetween; the first die base assembly further comprises aguide pillar lining corresponding to the guide pillar; the fixingportion further comprises a punch back plate, a punch fixing plate, anda fixing element that joins the punch back plate and the punch fixingplate; the fixing end portion of the trimming punch leans against thepunch back plate and is positioned at the punch fixing plate; the diecavity portion is formed of a die block and a die set.

In the trimming die according to the embodiment of the disclosure, thefirst slant grooves are arranged at intervals.

In the trimming die according to the embodiment of the disclosure, thefirst slant grooves are in the shape of a column-shaped recess, aV-shaped recess or an arc-shaped recess.

In the trimming die according to the embodiment of the disclosure, thesecond slant grooves are arranged at intervals.

In the trimming die according to the embodiment of the disclosure, thesecond slant grooves have the same length.

In the trimming die according to the embodiment of the disclosure, thesecond slant grooves are in the shape of a column-shaped recess, aV-shaped recess or an arc-shaped recess.

The disclosure further provides a trimming punch, comprising a trimmingend portion, wherein a peripheral surface of the trimming end portioncomprises a plurality of slant grooves.

In the trimming punch according to the embodiment of the disclosure, theslant grooves are arranged at intervals.

In the trimming punch according to the embodiment of the disclosure, theslant grooves have the same length.

In the trimming punch according to the embodiment of the disclosure, theslant grooves are in the shape of a column-shaped recess, a V-shapedrecess or an arc-shaped recess.

The disclosure is characterized in that the second slant grooves of thetrimming punch can reduce the trimming force of the punch on the blankduring the trimming operation, thereby improving the trimming quality ofthe blank.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a local schematic view of a trimming die before a trimmingpunch thereof performs a trimming operation on a blank;

FIG. 1B is a local schematic view of a trimming die in FIG. 1A when atrimming punch thereof is performing a trimming operation on a blank;

FIG. 2A is a schematic view of a trimming die before a trimming punchthereof performs a trimming operation on a blank according to anembodiment of the disclosure;

FIG. 2B is a local schematic view of a trimming die in FIG. 2A when atrimming punch thereof is performing a trimming operation on a blank;

FIG. 2C is a schematic view of a trimming die in FIG. 2A after atrimming punch thereof performs a trimming operation on a blank; and

FIG. 3 is a schematic view of a trimming die in which grooves of atrimming punch thereof and grooves of a die cavity inner wall are crossslant grooves according to another embodiment of the disclosure.

DETAILED DESCRIPTION

To make the objectives, features, and characteristics of the disclosuremore comprehensible, related embodiments of the disclosure are describedin detail below with reference to the accompanying drawings.

Referring to FIG. 2A, FIG. 2A is a schematic view of a trimming diebefore a trimming punch thereof performs a trimming operation on a blankaccording to an embodiment of the disclosure. An open-die state of thetrimming die 1 is shown in FIG. 2A. The trimming die 1 is used forperforming a trimming operation on a bank 20 and includes a first diebase assembly 11, a second die base assembly 12, and a trimming punch13. In this embodiment, the first die base assembly 11 is used as anupper die base assembly; the second die base assembly 12 is used as alower die base assembly. However, due to actual design requirements ofthe die, the disclosure is not limited to this pattern.

The first die base assembly 11 includes a fixing portion 110; the seconddie base assembly 12 is positioned opposite the first die base assembly11. The second die base assembly 12 includes a die cavity portion 120;the die cavity portion 120 has a die cavity 121 and a die cavity innerwall W. A surface (a surface of an effective working area) of the diecavity inner wall W has a plurality of first slant grooves G1 (more thantwo first slant grooves G1). In this embodiment, the die cavity portion120 is formed of a die block 120 a (a lower die block) and a die set 120b (a lower die set). The blank 20 is arranged on the die cavity portion120.

The trimming punch 13 is applied to the trimming die 1. The trimmingpunch 13 has a fixing end portion 131 and a trimming end portion 132positioned opposite the fixing end portion 131. The fixing end portion131 is disposed at the fixing portion 110; the trimming end portion 132is positioned corresponding to the die cavity 121. An externalperipheral surface of the trimming end portion 132 includes a pluralityof second slant grooves G2 (more than two second slant grooves G2).

Specifically, the first die base assembly 11 further includes a boltelement 111 and a blank holder 112 positioned corresponding to a surfaceof the die cavity portion 120. An end of the bolt element 111 isdisposed at the fixing portion 110; another end of the bolt element 111is disposed at the blank holder 112. A spring (not shown) may beassembled at the bolt element 111, and the spring is located between thefixing portion 110 and the blank holder 112.

In addition, the first die base assembly 11 and the second die baseassembly 12 further include a guide pillar 14 therebetween for guidingthe opening or closing of the trimming die 1; the first die baseassembly 11 further includes a guide pillar lining 140 corresponding tothe guide pillar 14, so as to prevent the guide pillar 14 from directlycontacting and thus damaging the first die base assembly 11.

The fixing portion 110 further includes a punch back plate 110 a, apunch fixing plate 110 b, and a fixing element 15 that joins the punchback plate 110 a and the punch fixing plate 110 b. The fixing endportion 131 of the trimming punch 13 leans against the punch back plate110 a and is positioned at the punch fixing plate 110 b.

Referring to FIG. 2A to FIG. 2C at the same time, FIG. 2B is a localschematic view of a trimming die in FIG. 2A when a trimming punchthereof is performing a trimming operation on a blank; FIG. 2C is aschematic view of a trimming die in FIG. 2A after a trimming punchthereof performs a trimming operation on a blank.

As shown in FIG. 2B, the surface at the die cavity inner wall W has aplurality of first slant grooves G1, and these first slant grooves G1are arranged at intervals. An external peripheral surface of thetrimming end portion 132 of the trimming punch 13 has a plurality ofsecond slant grooves G2. The second slant grooves G2 are arranged atintervals, and the second slant grooves G2 have the same length and forman effective working area.

When an operator wants to perform a trimming operation on a blank 20,the blank 20 may be placed on the die cavity portion 120. When thetrimming die 1 is driven, the first die base assembly 11 is enabled toapproach the second die base assembly 12 under the guide of the guidepillar 14. As shown in FIG. 2B, the blank 20 is fixed between the blankholder 112 and the die block 120 a.

At this time (as shown in FIG. 2B), while the trimming punch 13 isperforming the trimming operation on the blank 20, the second slantgrooves G2 on the peripheral surface of the trimming end portion 132 ofthe trimming punch 13 can reduce a trimming force of the trimming punch13 on the blank 20; meanwhile, the first slant grooves G1 of the diecavity inner wall W can reduce a trimming force of the blank 20 on aninner side of the die cavity 121, thereby improving trimming quality ofthe blank 20. After the trimming operation is completed, the trimmingdie 1 turns to a close-die state (as shown in FIG. 2C).

Referring to FIG. 3, FIG. 3 is a schematic view of a trimming die inwhich grooves of a trimming punch thereof and grooves of a die cavityinner wall are cross slant grooves according to another embodiment ofthe disclosure.

As shown in FIG. 3, the first slant grooves G1 may be in the shape of across slant groove; and the second slant grooves G2 may also be in theshape of a cross slant groove. Definitely, in different designs, thefirst slant grooves G1 and the second slant grooves G2 may becolumn-shaped recesses, V-shaped recesses, arc-shaped recesses orrecesses of other geometrical shapes (for example, recesses of irregularshapes); the shapes of the grooves are not limited to the disclosure ofFIG. 3. The trimming processing quality of the blank 20 can also beimproved by means of these patterns.

It should be noted that, although the trimming punch in the shape of around column is taken as an example for description, in a practicaltrimming die, in order to cater for the trimming shape or otherrequirements of the blank, the trimming punch may also be in the shapeof an elliptic column, a square column, a triangular column, and thelike, and the shape is not limited to the disclosure of the aboveembodiment. Moreover, the slant grooves on the peripheral surface of thetrimming end portion of the punch may also vary along with the shape ofthe trimming punch. In addition, the slant grooves (the first slantgrooves and the second slant grooves) on the peripheral surface of thetrimming end portion of the trimming punch and on the die cavity innerwall may also be applied to cutting faces of an upper cutter and a lowercutter of a shearing machine.

In conclusion, exemplary implementations or embodiments described aboveare used for illustrating the technical means adopted in the disclosureto solve the problem, and are not intended to limit the implementationscope of the disclosure. Equivalent changes and modifications madefollowing the meaning of the scope of the patent application oraccording to the scope of the patent shall fall within the scope of thepatent.

What is claimed is:
 1. A trimming die, comprising: a first die baseassembly, comprising a fixing portion; a second die base assembly,positioned opposite the first die base assembly, wherein the second diebase assembly comprises a die cavity portion; the die cavity portion hasa die cavity and a die cavity inner wall; the die cavity inner wall hasa plurality of first slant grooves; and a trimming punch, having afixing end portion and a trimming end portion positioned opposite thefixing end portion, wherein the fixing end portion is disposed at thefixing portion; the trimming end portion is positioned corresponding tothe die cavity; and a peripheral surface of the trimming end portioncomprises a plurality of second slant grooves.
 2. The trimming dieaccording to claim 1, wherein the first die base assembly furthercomprises a bolt element and a blank holder positioned corresponding tothe die cavity portion; an end of the bolt element is disposed at thefixing portion, and another end of the bolt element is disposed at theblank holder.
 3. The trimming die according to claim 2, wherein thefirst die base assembly and the second die base assembly furthercomprise a guide pillar therebetween; the first die base assemblyfurther comprises a guide pillar lining corresponding to the guidepillar.
 4. The trimming die according to claim 2, wherein the fixingportion further comprises a punch back plate, a punch fixing plate, anda fixing element that joins the punch back plate and the punch fixingplate; the fixing end portion of the trimming punch leans against thepunch back plate and is positioned at the punch fixing plate.
 5. Thetrimming die according to claim 2, wherein the die cavity portion isformed of a die block and a die set.
 6. The trimming die according toclaim 1, wherein the first slant grooves are arranged at intervals. 7.The trimming die according to claim 1, wherein the first slant groovesare in the shape of a column-shaped recess, a V-shaped recess or anarc-shaped recess.
 8. The trimming die according to claim 1, wherein thesecond slant grooves are arranged at intervals.
 9. The trimming dieaccording to claim 1, wherein the second slant grooves have the samelength.
 10. The trimming die according to claim 1, wherein the secondslant grooves are in the shape of a column-shaped recess, a V-shapedrecess or an arc-shaped recess.
 11. A trimming punch, comprising atrimming end portion, wherein a peripheral surface of the trimming endportion comprises a plurality of slant grooves.
 12. The trimming punchaccording to claim 11, wherein the slant grooves are arranged atintervals.
 13. The trimming punch according to claim 11, wherein theslant grooves have the same length.
 14. The trimming punch according toclaim 11, wherein the slant grooves are in the shape of a column-shapedrecess, a V-shaped recess or an arc-shaped recess.